title: Four-wavelength microdisk laser array laterally coupled with a bus waveguide.
abstract: A four-wavelength microdisk laser array laterally coupled with a bus waveguide is demonstrated numerically and experimentally. The coupled-mode characteristics as well as scattering loss in the bus waveguide caused by the connected microdisks are simulated by a 2D finite-difference time-domain technique. An AlGaInAs/InP microdisk laser array with circular radii of 10.1, 10.2, 10.3, and 10.4 μm is designed and fabricated by common photolithography and an inductively coupled-plasma etching technique. Continuous-wave electrically injected operation is realized at room temperature with the lowest threshold current of 3 mA. Four-wavelength lasing operation is realized with wavelength intervals of 3-4 nm and side mode suppression ratios larger than 25 dB. Finally, the influences of heating effect and thermal cross talk on lasing mode wavelength tuning are investigated experimentally.
authors.forename: Ling-Xiu
authors.initials: LX
authors.lastname: Zou
authors.forename: Xiao-Meng
authors.initials: XM
authors.lastname: Lv
authors.forename: Yong-Zhen
authors.initials: YZ
authors.lastname: Huang
authors.forename: Heng
authors.initials: H
authors.lastname: Long
authors.forename: Qi-Feng
authors.initials: QF
authors.lastname: Yao
authors.forename: Jin-Long
authors.initials: JL
authors.lastname: Xiao
authors.forename: Yun
authors.initials: Y
authors.lastname: Du